polio <- structure(c(0, 1, 0, 0, 1, 3, 9, 2, 3, 5, 3, 5, 2, 2, 0, 1, 0, 
1, 3, 3, 2, 1, 1, 5, 0, 3, 1, 0, 1, 4, 0, 0, 1, 6, 14, 1, 1, 
0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 
0, 2, 0, 1, 0, 1, 0, 0, 1, 2, 0, 0, 1, 2, 0, 3, 1, 1, 0, 2, 0, 
4, 0, 2, 1, 1, 1, 1, 0, 1, 1, 0, 2, 1, 3, 1, 2, 4, 0, 0, 0, 1, 
0, 1, 0, 2, 2, 4, 2, 3, 3, 0, 0, 2, 7, 8, 2, 4, 1, 1, 2, 4, 0, 
1, 1, 1, 3, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 2, 0, 2, 
0, 0, 0, 1, 0, 1, 0, 1, 0, 2, 0, 0, 1, 2, 0, 1, 0, 0, 0, 1, 2, 
1, 0, 1, 3, 6), .Tsp = c(1970, 1983.91666666667, 12), class = "ts")
